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Forum: Probability

Probability course and homework discussion. Probability distributions. Probability theory, stochastic processes

  1. Arrow Sticky Thread Sticky: We only provide homework help to those who show effort

    Welcome to Talk Stats Forum. In order to keep homework help effective and efficient, we request all members to abide by these guidelines: 1)...

    Started by quark‎, 09-30-2005 09:44 AM
    • Replies: 0
    • Views: 30,323
    09-30-2005, 09:44 AM Go to last post
  1. Correlation coefficient and Expected Value

    Hi there, I'm doing an introductory statistics course and I'm having a little trouble with one of the questions. I am supposed to find out what...

    Started by purpleturtle‎, 09-15-2015 10:21 AM
    • Replies: 0
    • Views: 1,628
    09-15-2015, 10:21 AM Go to last post
  2. Correlation coeficient(X,rank(X))

    Given a sample of size N from a standard normal, I'd like to compute the correlation coeficient(X,rank(X)). So I need the expected value fo X*F(X)......

    Started by Devanil‎, 04-07-2013 08:13 PM
    • Replies: 3
    • Views: 1,946
    04-09-2013, 05:09 PM Go to last post
  3. correlation matrix

    E = integral o to 2i of the exp( ) = 2*pi*exp(i*x1(-m)) likewise for the x2 *x2 case = 2*pi*exp(i*x2*(-m)) For the other two parts E = I am...

    Started by stephanie‎, 03-13-2014 10:24 PM
    • Replies: 1
    • Views: 1,388
    03-15-2014, 10:56 PM Go to last post
  4. Correlation of the product of 2 multivariate normal variables...

    hello everyone! i've got a quick theoretical question that i'm gearing towards a simulation exercise but i need to get my stuff right first... ...

    Started by spunky‎, 07-25-2011 11:16 PM
    • Replies: 12
    • Views: 5,967
    07-28-2011, 01:33 AM Go to last post
  5. Cossing Toins-Probability

    If I toss 10 coins, how do I find the probability that 8 of them will land on heads? Could someone help me out?

    Started by pc678‎, 10-07-2008 08:02 PM
    • Replies: 11
    • Views: 2,986
    10-08-2008, 10:14 AM Go to last post
  6. cost estimating with probability

    i'm trying to do a quick cost estimation using this monte carlo program to see how it works but i'm also trying to factor in different types of risk...

    Started by gummibear‎, 08-19-2008 05:14 PM
    • Replies: 0
    • Views: 4,094
    08-19-2008, 05:14 PM Go to last post
  7. Talking Could someone please help me and answer my question?????

    I posted the entire question earlier in the thread and I would greatly appreciate it if someone would help me and show me how to do the problem step...

    Started by Aingeal34‎, 09-17-2007 11:38 PM
    • Replies: 0
    • Views: 1,801
    09-17-2007, 11:38 PM Go to last post
  8. Could someone please help? Probability of sampling error?

    This is one concept I cannot understand. I'm studying for a test and loathe the probability chapter. Here is the problem and I following all of the...

    Started by mnb124‎, 04-14-2012 05:56 PM
    • Replies: 12
    • Views: 5,618
    04-15-2012, 06:45 AM Go to last post
  9. Could you help me out with this function please?

    Hello everyone. I am currently working with this stochastic function in a dynamic model simulation: N(t) such that N(0)=1 In every time step...

    Started by manu_jm‎, 03-11-2013 10:41 AM
    • Replies: 3
    • Views: 2,125
    03-19-2013, 08:25 AM Go to last post
  10. count of integers in sliding window

    Hi all, I'm looking to generate a series of integers in the range , that start off with a large spacing, like 2 50 101, etc. At a peak of some...

    Started by discoross‎, 12-18-2009 03:45 AM
    • Replies: 11
    • Views: 5,654
    02-26-2010, 06:29 AM Go to last post
  11. Counting methods

    Hello, So I have a question that I thought I did right but in reality, was wrong. The question goes as followed: Suppose I give you a list of 20...

    Started by ssx‎, 10-04-2015 08:20 PM
    • Replies: 0
    • Views: 3,310
    10-04-2015, 08:20 PM Go to last post
  12. counting probability

    i need some help counting probability using Bayes theorem given that 1/10 of message is a spam message. spam detector will correct identify a...

    Started by zxcvbnm123‎, 07-24-2013 03:03 PM
    • Replies: 5
    • Views: 2,095
    07-28-2013, 09:27 AM Go to last post
  13. Counting probability given the mean and standard deviation

    Hi all :-) I'm trying to find solution to the following problem, could anyone please help ? In response to the increasing weight of airline...

    Started by Honka‎, 01-16-2012 01:19 PM
    • Replies: 3
    • Views: 6,529
    01-17-2012, 04:23 PM Go to last post
  14. counting problem?

    A closet contains 6 different pairs of shoes. Five shoes are drawn at random. What is the probability that at least one pair of shoes is obtained?

    Started by anyavacy‎, 10-22-2013 06:14 PM
    • Replies: 2
    • Views: 1,266
    11-11-2013, 05:48 PM Go to last post
  15. Counting problem?

    NOW SOLVED. SPECIAL THANKS TO rogojel and con-tester. This is probably a simple problem, but I have been through my 8 counting rules about different...

    Started by Swayseker‎, 07-22-2015 07:41 AM
    • Replies: 3
    • Views: 1,558
    07-22-2015, 10:55 AM Go to last post
  16. Counting question

    Hey, I am not able to find the number of combination when I have 100 varaibles... with 2, I have: AB: A - B - AB = 3 combinations with 3, I...

    Started by Benoit I‎, 06-04-2008 07:35 PM
    • Replies: 2
    • Views: 3,213
    06-04-2008, 08:53 PM Go to last post
  17. Counting question

    A bit of an odd problem because I was just doing this out of curiosity while helping a friend with this. I have a hat with 5 cards in it. I want...

    Started by c2q‎, 03-27-2011 09:45 PM
    • Replies: 2
    • Views: 2,261
    03-27-2011, 10:12 PM Go to last post
  18. Counting Question

    Question: If I had X number of train cars and I wanted to know the probability of having Y or more people in a car when I have N total of people. How...

    Started by Toonzaka‎, 09-30-2013 04:11 AM
    • Replies: 1
    • Views: 1,278
    09-30-2013, 06:47 AM Go to last post
  19. Question Counting question

    4 selections of single digits are made at random with replacement, from the 10 digits 0-9. Find the probability that these sum to 20. I thought...

    Started by MathJack‎, 03-09-2015 04:44 PM
    • Replies: 1
    • Views: 1,182
    03-10-2015, 02:24 AM Go to last post
  20. Question counting rule questions

    Consider 5 card poker hands dealt from a 52 card deck. two important events are: A(you draw a flush), B(you draw a straight). Q: find P(A)? find...

    Started by new‎, 07-29-2006 04:55 PM
    • Replies: 0
    • Views: 2,600
    07-29-2006, 04:55 PM Go to last post
  21. counting rule?

    20 students have to be split into 5 different labs groups; how many ways can we partition them if the first 3 labs have 3 students, the 4th has 5...

    Started by SadieKhan‎, 09-19-2010 11:51 AM
    2 Pages
    1 2
    • Replies: 15
    • Views: 6,176
    09-20-2010, 10:52 AM Go to last post
  22. counting rules

    "A fleet of ten taxis is to be dispatched to three locations in such a way that three taxis go to the first location, five taxis go to the second...

    Started by jettagrl‎, 09-19-2006 08:07 PM
    • Replies: 3
    • Views: 3,904
    09-21-2006, 06:51 AM Go to last post
  23. Counting rules.

    Hi, Can someone please explain to me why the answer to this question is as written? Suppose we deal four 13-card bridge hands from an ordinary...

    Started by c2q‎, 09-24-2010 03:50 PM
    • Replies: 9
    • Views: 6,803
    09-26-2010, 08:20 PM Go to last post
  24. counting tree?

    Here is a problem I need help with: A USA Today national survey of heads of households found that 24% of women had asked for a raise, and of those...

    Started by ruthlathe‎, 04-15-2009 08:51 PM
    • Replies: 2
    • Views: 3,483
    04-18-2009, 02:33 PM Go to last post
  25. Covariance of a linear comb. of independent variables

    U = y1 - 2y2 + y3 W = 3y1 + y2 E = 1, E = 2, E = -1, Var = 1, Var = 3, Var = 5 Var(U) = 12, Var(W) = 12 ;I hope y1, y2, y3 are Independent RV's...

    Started by alias‎, 10-18-2012 07:05 PM
    • Replies: 2
    • Views: 1,748
    10-18-2012, 10:48 PM Go to last post
  26. Thumbs up Covariance of random balls

    Hi, would appreciate any comments: I have: 10 balls with number 6 on each, 10 balls with n. 7, 10 balls with n. 8. So it's 30 balls in...

    Started by binjip‎, 07-09-2011 01:39 PM
    covariance
    • Replies: 2
    • Views: 2,025
    07-09-2011, 06:17 PM Go to last post
  27. Covariance of unconditional density

    I do have a minor problem with a simple covariance matrix. Let x be a first order Markov chain of length n defined by the transition matrix P,...

    Started by Tosha‎, 09-29-2015 04:39 AM
    • Replies: 0
    • Views: 1,071
    09-29-2015, 04:39 AM Go to last post
  28. Covariance question without using integrals

    Hello, I am trying to figure out a way to do the following question without using integrals. X is distributed as Unif with Y=-log(X). Find...

    Started by GTaiko‎, 11-17-2012 10:42 PM
    • Replies: 4
    • Views: 2,454
    11-18-2012, 01:51 AM Go to last post
  29. Craps Probability

    I was a math major at Johns Hopkins, but for some reason this is giving me trouble. I want to know the probability of rolling EITHER a 4, 5, 9, or...

    Started by CaZeek‎, 04-15-2012 03:10 AM
    • Replies: 3
    • Views: 1,849
    04-15-2012, 05:36 AM Go to last post
  30. Crazy union/intersection question.

    Paul will be taking three exams - call them A, B and C. You are given: -It is certain that he will pass at least one exam. -The probability that...

    Started by stedwick‎, 02-05-2007 02:58 AM
    • Replies: 1
    • Views: 2,862
    02-05-2007, 12:17 PM Go to last post
  31. Create Probability Table!

    I need help with this question, I can't figure it out for the life of me! I mostly need help setting it up in a table! PLEASE EXPLAIN YOUR PROCESS...

    Started by Kennedy‎, 01-17-2013 05:40 PM
    • Replies: 3
    • Views: 1,247
    01-17-2013, 06:07 PM Go to last post
  32. Creating a joint probability table

    I need help figuring out how to create this joint probability table 43 million people in the United States go without health insurance. Sample...

    Started by elementarystat‎, 09-03-2009 02:17 PM
    • Replies: 3
    • Views: 19,062
    09-03-2009, 09:58 PM Go to last post
  33. creating conditional probability distribution

    I have a system which visits two locations and collects signals every 10 seconds. It is well known that A causes B to occur but not all the time. So,...

    Started by Vatsa‎, 02-03-2013 05:19 PM
    conditional probabilities
    • Replies: 0
    • Views: 2,013
    02-03-2013, 05:19 PM Go to last post
  34. creating sten scores

    Hi, Please can someone help me out with creating a sten score - I am unsure of the process to follow to do this - is it something that can be...

    Started by AnnaHoy‎, 03-20-2006 12:01 AM
    • Replies: 0
    • Views: 6,016
    03-20-2006, 12:01 AM Go to last post
  35. Credit Card Probability

    Last year 75% of Kmart Department Stores credit card purchases were for less than $150. In a random sample of 200 credit card companies, what is the...

    Started by TI30‎, 12-05-2010 01:54 PM
    • Replies: 2
    • Views: 4,437
    12-05-2010, 08:03 PM Go to last post
  36. Credit Card Roulette - Expected Value

    4 people just finished dinner and the bill arrives. The total tab is $100. When paying for the bill what is better (for the individual): (1) split...

    Started by jmmcd‎, 06-16-2008 10:09 AM
    • Replies: 1
    • Views: 4,639
    06-16-2008, 04:08 PM Go to last post
  37. Crews of 3

    There are 25 machinists employeed by a company a. if a night crew consists of 3 machinists, how many different crews are possible. (is this a...

    Started by psu2007‎, 07-10-2009 01:17 PM
    • Replies: 0
    • Views: 2,687
    07-10-2009, 01:17 PM Go to last post
  38. cross corealtion matrix

    Hi can any body help that how can we calculate a cross correlation matrix coeff in real time uzmeed

    Started by uzmeed‎, 04-18-2011 05:45 AM
    • Replies: 0
    • Views: 2,335
    04-18-2011, 05:45 AM Go to last post
  39. cross term

    The book says that the following cross term can be shown to be zero by iterating the expectation: E. What does it mean "to iterate the...

    Started by Kiuhnm‎, 10-28-2013 07:40 AM
    expectation
    • Replies: 1
    • Views: 1,041
    10-28-2013, 09:52 AM Go to last post
  40. Crying inside 😖 just can't quite get probability

    I'm taking stats online and this unit is on probability. I'm having a terrible time understanding it. The conditional probability rule is where I'm...

    Started by notastatswizard‎, 06-29-2015 03:03 AM
    • Replies: 0
    • Views: 18,960
    06-29-2015, 03:03 AM Go to last post
  41. cumulants

    I don't know much about cumulants. What I know is that they can be generated by using the cumulant generating function g(t) = \log(E). I'm studying...

    Started by Kiuhnm‎, 08-28-2013 04:05 PM
    cumulants
    • Replies: 1
    • Views: 1,968
    08-29-2013, 12:54 AM Go to last post
  42. Cumulative Beta Distribution Function Help

    Hi everyone, I was wondering if someone could help me figure out how this function works. My problem is not that I need homework help, it's that...

    Started by idkstats14‎, 12-22-2010 02:21 PM
    • Replies: 13
    • Views: 12,641
    05-05-2014, 04:07 AM Go to last post
  43. Cumulative combinations

    I wish to determine the probability of a team winning AT LEAST eight of its next ten games. I understand that 10C8 will tell me the probability of...

    Started by johnnic‎, 07-04-2010 04:55 AM
    • Replies: 5
    • Views: 4,566
    07-04-2010, 10:12 AM Go to last post
  44. Cumulative Distribution

    Can anyone explain how to do this problem: Let X be a random variable uniformly distributed in the interval (0, 1). Find the cumulative distribution...

    Started by panda‎, 11-09-2014 05:45 PM
    • Replies: 2
    • Views: 1,685
    11-09-2014, 06:25 PM Go to last post
  45. Question Cumulative Distribution Function

    Please help me, I have 2 cases: 1. n is positive constant and defined by function f(x)=1/2.n.e^(-n.x) if x>=0 and f(x)=1/2.n.e^(-n.x) if x<0....

    Started by statjunior‎, 10-19-2010 10:59 PM
    • Replies: 8
    • Views: 10,209
    10-26-2010, 01:37 AM Go to last post
  46. cumulative distribution function for error

    Hi, I need help regarding the generation of cumulative distribution function (CDF) for distance error. I have a system which calculates...

    Started by hammid1981‎, 03-03-2011 10:15 AM
    • Replies: 9
    • Views: 6,284
    03-04-2011, 12:06 AM Go to last post
  47. Cumulative distribution function help!

    Hey, I'm new here. I'm stuck with this problem. Will post what I've tried to do. Hopefully someone can provide hints to help me out. Thanks. If Z...

    Started by knighty‎, 03-16-2009 12:42 PM
    • Replies: 1
    • Views: 3,688
    03-16-2009, 12:58 PM Go to last post
  48. cumulative distribution function of a uniform distribution

    I just need some help on the question below. Bacteria are grown in a dish for a length of time (in hours) T which is a random variable with a...

    Started by gstyles1‎, 10-30-2012 08:16 AM
    cdf, probability, uniform distribution
    • Replies: 1
    • Views: 1,555
    10-30-2012, 10:17 AM Go to last post
  49. Cumulative distribution help.

    Okay so I've got this question: Let X be a random variable with a cumulative distribution function Fx. Prove that P(x=a) = 0 if and only if Fx is...

    Started by c2q‎, 10-10-2010 08:10 PM
    • Replies: 11
    • Views: 6,003
    10-11-2010, 06:25 PM Go to last post
  50. Cumulative probability formula - majority of trials

    I posted a question below (28 June) on forward error correction which got no replies because it was too naive. I've found the answer I think which is...

    Started by crofter‎, 07-29-2014 06:51 AM
    • Replies: 0
    • Views: 1,515
    07-29-2014, 06:51 AM Go to last post
  51. Cup and ball game: what are the odds of that?

    OK we are having an intelectual discussion (no, really) about the change in odds during the classic cup and ball game. To explain: a dealer has...

    Started by bonedoctor‎, 02-22-2010 06:27 PM
    • Replies: 2
    • Views: 12,597
    02-22-2010, 08:00 PM Go to last post
  52. Curious read Chi-sq table

    for the rejection of hypothesis (2-tailed) with p=0,05 which chi-square table is correct, in example d.f.=4 and alpha=0,05. is it 0,484 (left) and...

    Started by sg2kilo‎, 09-10-2012 11:04 AM
    • Replies: 7
    • Views: 3,584
    09-10-2012, 09:47 PM Go to last post
  53. Customer Retention Probability

    I'm not a statistician so forgive my ignorance. Here's what I'm trying to do: I have a list of all customers active and cancelled. I have tables...

    Started by stevedg‎, 06-18-2014 02:39 PM
    • Replies: 2
    • Views: 1,539
    06-19-2014, 01:27 AM Go to last post
  54. customer service problem

    N customers circulate in a closed system with two servers. In Server 1 and Server 2, service times are exponential with parameters 1 and 2,...

    Started by dalibocai‎, 04-17-2012 09:12 PM
    markov chains, stochastic process
    • Replies: 0
    • Views: 897
    04-17-2012, 09:12 PM Go to last post
  55. Question Cycle of permutation Problem

    Dear everyone, I have questions about cycle of permutation. Here are the questions. For ones who haven't heard about cycle, Anyway, I...

    Started by ilhamdoank‎, 10-26-2011 06:10 PM
    • Replies: 3
    • Views: 4,820
    01-30-2012, 01:04 AM Go to last post
  56. D&D GM Needs Help Calculating Stat-Upgrades

    Hello! I've never taken a stat class, so bear with me if this seems basic. I have searched for a while for a solution to this, but nothing has been...

    Started by Marshmeloo‎, 02-17-2015 05:43 AM
    • Replies: 3
    • Views: 1,175
    02-18-2015, 12:45 AM Go to last post
  57. Darts probabilty

    when we throw a dart at a target, we have a probability of 1/4 of hitting the target . what is the probability of obtaining at least one hit if three...

    Started by Sajid Zaman‎, 09-25-2011 04:43 AM
    • Replies: 1
    • Views: 1,626
    09-25-2011, 07:49 AM Go to last post
  58. Moved: Data Entry

    Started by Matthew18342‎, 02-15-2013 01:15 PM
    • Replies: -
    • Views: -
    02-15-2013, 01:22 PM Go to last post
  59. Data probability/density

    Hi, hope im in the right place. Im trying to find the best way to characterize the different data on this space? to 3 draw regions (or lines with...

    Started by barakah‎, 05-01-2015 09:47 AM
    • Replies: 4
    • Views: 1,413
    05-01-2015, 03:45 PM Go to last post
  60. de Morgan's law

    I need help. I just can't figure out where to go with this one.. For two events A and B show that: P(A intersection B) is greater than or...

    Started by tyankee‎, 09-01-2008 03:56 PM
    • Replies: 1
    • Views: 4,823
    09-02-2008, 03:12 AM Go to last post

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